AVIF: added support to XMP and EXIF metadata

Allow to load/save info about:
- GPS info (latitude, longitude, altitude)
- Various text info (title, description, author, copyright, etc...)
- Image resolution

The compatibility of the modifications has been tested with GIMP.

src/imageformats/microexif.cpp

@@ -1024,6 +1024,13 @@ MicroExif MicroExif::fromByteArray(const QByteArray &ba)
     return fromDevice(&buf);
 }
 
+MicroExif MicroExif::fromRawData(const char *data, size_t size)
+{
+    if (data == nullptr || size == 0)
+        return {};
+    return fromByteArray(QByteArray::fromRawData(data, size));
+}
+
 MicroExif MicroExif::fromDevice(QIODevice *device)
 {
     if (device == nullptr || device->isSequential())